TIMELINE: Tensions between Sudan and Chad

(Reuters) - Darfur rebel leader Khalil Ibrahim said on Monday he would launch more attacks on Sudan’s capital Khartoum until the government fell.

Sudan has said neighboring Chad was backing the rebels.

Here is a chronology of recent Chad-Sudan tensions:

Jan/Feb 2004 - Thousands of refugees from Sudan’s Darfur region arrive in Chad fleeing government bombings and raids by Arab Janjaweed militias.

April 9 - Chad brokers a ceasefire between the Sudanese government and two Darfur rebel groups.

April 11, 2005 - Chad suspends mediation, accusing Sudan of supporting Chadian rebels. It returns to mediation after promises from Khartoum that it would act against the rebels.

December 18 - Chad says its forces killed about 300 rebels after they launched a failed offensive on the border town of Adre. Sudan denies involvement.

Jan 8, 2006 - Chad demands Sudan disarm Chadian rebels in Darfur as a condition for peace talks.

Feb 8 - Chad and Sudan agree to put an end to their dispute at a meeting in Libya.

April 13 - Chad government forces fight off attack by rebels on the capital N’Djamena. Several hundred people killed. Deby breaks diplomatic relations with Sudan the next day.

July 26 - Chad and Sudan revive their deal in Libya to defuse tension on the border.

Aug 8 - Chadian President Idriss Deby and Sudanese President Omar Hassan al-Bashir agree to restore ties.

Feb 1, 2007 - Rebels fighting to overthrow Deby launch an attack on Adre, before being beaten back.

Feb 22 - At a conference in Libya, leaders of Sudan and Chad pledge to redouble efforts to end border violence, concluding their third agreement in a year.

May 3 - Sudan and Chad sign a Saudi-brokered reconciliation deal in Riyadh, requiring both sides to cooperate with the U.N. to stabilize Darfur and the adjacent region in Chad.

Oct 25 - Chad and four Sudan-based Chadian rebel groups sign a “definitive peace accord” in Libya. At least two groups later abandoned the accord.

Feb 3, 2008 - Rebels surrounding Deby’s presidential palace in N’Djamena after storming into the capital, are beaten back. Former colonial power France rallies behind Deby.

Feb 5 - Rebels say they will agree to a ceasefire only if Deby steps down.

March 13 - Omar and Deby sign a non-aggression deal in Senegal in an effort to end cross-border rebel attacks however Chadian rebels dismiss the peace pact the next day.

April 12 - Darfur rebels and Sudanese armed forces clash in West Darfur in a renewal of fighting.

May 10 - Rebels make a lightning advance from the western Darfur region to attack Khartoum in a bid for power. About 65 people are believed to have been killed in the attacks.

May 11 - Sudan cuts diplomatic relations with Chad after the attack on Khartoum which it said was supported by Chadian President Deby. Chad denies involvement.